Table 6

Comparing results from alternative predictions

Dependent variable: Child hospitalized in last year for respiratory condition ( = 1 )	Monitors within 50 miles for all pollutants^{^a}		Monitors within 30 miles for all pollutants		Monitors within 15 miles for all pollutants		At least one monitor in country for all pollutants
	All at once	One at a time	IDW 30	(CO) Kriging	IDW15	(CO) Kriging	County weighted average	(CO) Kriging
All controls
CO	0.002 [0.008]	0.004 [0.008]	0.004 [0.007]	−0.003 [0.013]	0.007 [0.026]	−0.029 [0.030]	−0.003 [0.007]	0.009 [0.014]
PM10 (*100)	0.026 [0.029]	0.03 [0.029]	−0.049^* [0.027]	−0.021 [0.042]	0.022 [0.151]	0.057 [0.218]	0.01 [0.054]	0.025 [0.107]
SO₂	0.271 [0.492]	0.545 [0.465]	0.745 [0.934]	−0.005 [1.168]	−3.887 [3.349]	−2.06 [3.763]	−0.112 [1.132]	1.459 [1.637]
NO₂	−0.055 [0.357]	−0.003 [0.337]	−0.345 [0.446]	0.043 [0.538]	−0.435 [1.243]	−0.747 [1.541]	—1.137^*** [0.370]	−0.141 [0.644]
O₃	0.207^** [0.104]	0.216^** [0.104]	0.072 [0.229]	0.182 [0.120]	−0.761 [0.524]	−0.499 [0.518]	−0.299 [0.337]	0.379 [0.263]
Observations	114612		64348	64348	12103	12103	43353	43353
R-squared	0.28		0.36	0.36	0.58	0.58	0.37	0.37
All controls and family fixed effects
CO	0.024^** [0.011]	0.025^** [0.011]	0 [0.009]	0.01 [0.012]	−0.017 [0.028]	−0.004 [0.035]	0.008 [0.013]	0.009 [0.019]
PM10 (*100)	−0.007 [0.047]	0.006 [0.051]	−0.093^** [0.044]	−0.122^** [0.061]	−0.045 [0.110]	−0.051 [0.218]	−0.02 [0.067]	−0.039 [0.088]
SO₂	0.239 [1.117]	0.538 [1.186]	2.081^** [0.938]	0.619 [1.737]	1.297 [2.253]	3.873 [2.393]	0.904 [1.543]	1.787 [1.877]
NO₂	−0.353 [0.567]	−0.352 [0.607]	−0.929 [0.604]	−0.562 [0.574]	−1.25 [1.077]	−1.391 [1.133]	−1.000^* [0.503]	−0.993 [0.678]
O₃	0.350^** [0.154]	0.367^** [0.153]	0.505 [0.432]	0.498^** [0.215]	0.005 [0.696]	−0.168 [0.548]	−0.482 [0.659]	0.097 [0.363]
Observations	114,612		64,348	64,348	12,103	12,103	43,353	43,353
R-squared	0.5		0.52	0.52	0.55	0.55	0.51	0.51

↵a. the sample includes bases for which the closest monitor for each of the five pollutants is within 50 miles of the base. All models include all controls as described in the notes for Table 4.
↵* significant at 10 percent; ** significant at 5 percent; *** significant at 1 percent.